I use Freeletics daily. I really enjoy using the app and I think I get a great exercise. I adopted Freeletics after the recent Nike Training Club update that deprecated plans.
I've found the workouts in Freeletics to be easier than NTC but the overall quality of session is identical.
I really like the "Coach" concept. I've noticed the coach updating my plan week to week and increasing what I am expected to perform. That's totally unique within the workout app space from my experience.